Carburetor



June 1, i937. T. UNSA 2,082,294

l cARBUgEToR y Fild 001'.. l8, 1936 Patented June l, 1937 STATES acsazaiPATENT omen CARBUBETOB Toi-Mom Hinge, Kokomo, Ind.

Application October 8, 1936, Serial No. 104,661

4 Claims.

tendency to cease functioning upon quick closing of the carburetorthrottle-valve if the idlingl speed of the engine has been set low, sayabout iive miles per hour, the reason for this inclination to ceaseoperation being that the liquid fuel in the intake-manifold, some ofwhich lines the walls of the manifold and some of which is entrained inthe air as small drops or globules, evaporates at a faster rate underthe greatly increased suction due to such throttle closing and thereforecauses a temporarily over-rich fuel mixture forthe engine-cylinders.

If, in addition to such specied condition, the

5 brakes are applied to the automobile wheels to abruptly stop itsprogress, the' liquid fuel in the intake manifold rushes forwardlytherein, causing an unequal distributiton to the engine-cylinders,which, of course, aggravates the stalling 0 tendency.

If the idling speed of a. car has a comparatively vlow adjustment ofabout nve miles per hour, such proneness for the engine to ceaseoperation is great, but if the idling speed is set at eight to ten milesper hour, such characteristie is much less; but many automobile driversobject to so high an idling speed; l

The main object of this invention, which is described hereinafter indetail, is toprevent or avoid such engine stalling by providing a bypassaround the throttle-valve and supplying meansv to open such by-passautomatically for the period of deceleration of the vehicle, thusallowing the motor a comparatively-high idling speed for a few momentsand hence permitting it to satisfactorily use such over-richfuel-mixture for such short periods, and, when this bypassuitimatelycloses, the motor will continue in operation because by that time thefuel-mixture in the intake-manifold will have e 'substantially normalfor idling conditions.V

To enable those skilled in'this art to understand the new inventioniully both from structural and functional standpointaa present pre--ieri-ed ement of the same has been shown in detail in the figures of theaccompanying drawing, in the views of which like reference numerals havebeen employed to designate th same parts.

In this drawing'- l Figure 1 is a vertical section on line i--i ofFigure 2 of that portion of any suitable type of carburetor having athrottle-valve and equipped with the new means for the elimination ofthe stalling tendency; and

Figure 2 is a horizontal section on line -t of Figure l.

In this carburetor, the inductionwww.: ge 4 is supplied with thecustomary throttle-valve and the front side of such portion of thecarburetor, that is, the side toward the iront or radiator oi theautomobile has a hollow en' largement thus internallyprovig an uprightchamber 'i recta in horizontal crosssection which is closed to, theatmosphere but which is connected to the induction r e t by the twoconduits t and above the throttlevalve and by the 1 e i@ below suchthrottlevalve, and, from an understanding of such construction, it willbe readily appreciated that the passages Q, 'E and I@ unitedly orconjointly comprise a by-pass around the throttle-valve,

and, in` order that such by-pass may be openedl and closedautomatically, the construction also incorporates a .pendulum-valve ilin the chamber 'i and ulcrumed near its top end at i2, such valve beingmade of a square bar and when hanging down in normal vertical position,as shown in Figures l and 2, closing the connections between'theconduits. 8 and t and the chamber 1.

From what precedes it will be readily understood that when thethrottle-valve is quickly closed causing rapid deceleration oi' vehicle,this pendulum-valve I I will swing forwardly automatically toward thedotted-line position inisV dicated in Figure 1, thereby temporarilyopen--y ing the by-pass, and, consequently, for a few moments, incr theidling speed of the engine due to the increased delivery of fuelthereto. lwhich augmented speed satisfactorily cares for the temporarilysuper-rich fuel-ture, and when the period oi deceleration terminates,the

pendulum by avity automatically 'ffr:

to its no upright tion, cl t e bypass; but, as easily comprehended. theemcientiunction of the valve and will ,have accomplished the desiredyresult by allowthan ing the motor-stew moments or mms: mung during thecritical penna referred Stated somewhat differently, the temporaryopening of the by-pass accomplishes practically the same result as wouldbe reached by a slight opening or the throttle-valve, but, of course,the pendulum-valve functions lentirely automatically' and withoutattention on the part of the driver of the automobile.

Whereas hereinbefore a desirable embodiment of the invention has beenpresented, it is to be.

1. In a carburetor for an internal-combustion engine of a vehicle, thecombination of an'in- `duction-passage, a throttle-valve for saidpassage, and means, actuated by inertia, to automatically temporarilysupDLv to the engine as,

sutlloiently increased quantity oi fuel-mixture to prevent the enginefrom stalling upon closure of the throttle-valve and deceleration o! thevehicle. 4

2. In a carburetor for an internal-combustion engine of a. vehicle, thecombination of an induction-passagaa throttle-valve for said passage, aby-pass around said throttle-valve, and

an automatically-operated valve, actuated by( inertia, controlling saidby-pass, and temporarily opening said by-pass more or' less depending onthe rate of vehicle deceleration, whereby to prevent stalling of theengine.

3. In a carburetor for an internal-combustion engine oi' a vehicle, thecombination of an induction-passage, a throttle-valve for said passage,a by-pass around said throttle-valve, and an automatically-actinggravity-actuated pendulumvalve, normally closing said by-pass, buttemporarily opening said by-pass upon closure of the throttle-valve anddeceleration of the vehicle, whereby to prevent stalling of the engine.

4. In a carburetor for an internal-combustion engine of a vehicle, thecombination o! an induction-passage, a throttle-valve for said passage,and inertia-actuated means to automatically temporarily supply to' theengine a sumciently increased quantity of fuel-mixture to preventstallingof the engine upon closure oi the throttle-valve.

TonaJoaN LINGA.

